Tóm tắt nội dung: Mission-critical business applications need immediate and guaranteed data delivery. Attempts have been made (like Comet) to adapt AJAX techniques to support such applications These attempts have been based on using unreliable push techniques or resource-greedy polling techniques. However, Ajax On-Demand is an adaptation of AJAX for such applications that doesn't suffer from these disadvantages. The concept of upside-down AJAX (a.k.a. Reverse Ajax, Comet, or...